VolumeProvider

Kotlin |Java

abstract class VolumeProvider

kotlin.Any
↳	android.media.VolumeProvider

Handles requests to adjust or set the volume on a session. This is also used to push volume updates back to the session. The provider must call setCurrentVolume(int) each time the volume being provided changes.

You can set a volume provider on a session by calling MediaSession#setPlaybackToRemote.

Summary

Constants
static Int	`VOLUME_CONTROL_ABSOLUTE` The volume control uses an absolute value.
static Int	`VOLUME_CONTROL_FIXED` The volume is fixed and can not be modified.
static Int	`VOLUME_CONTROL_RELATIVE` The volume control uses relative adjustment via `onAdjustVolume(int)`.

Public constructors
`VolumeProvider(volumeControl: Int, maxVolume: Int, currentVolume: Int)` Creates a new volume provider for handling volume events.
`VolumeProvider(volumeControl: Int, maxVolume: Int, currentVolume: Int, volumeControlId: String?)` Creates a new volume provider for handling volume events.

Public methods
Int	`getCurrentVolume()` Gets the current volume.
Int	`getMaxVolume()` Gets the maximum volume this provider allows.
Int	`getVolumeControl()` Gets the volume control type that this volume provider uses.
String?	`getVolumeControlId()` Gets the `routing controller id` of the `RoutingController` associated with this volume provider, or null if unset.
open Unit	`onAdjustVolume(direction: Int)` Override to handle requests to adjust the volume of the current output.
open Unit	`onSetVolumeTo(volume: Int)` Override to handle requests to set the volume of the current output.
Unit	`setCurrentVolume(currentVolume: Int)` Notifies the system that the current volume has been changed.

Constants

VOLUME_CONTROL_ABSOLUTE

Added in API level 21

static val VOLUME_CONTROL_ABSOLUTE: Int

The volume control uses an absolute value. It may be adjusted using onAdjustVolume(int) or set directly using onSetVolumeTo(int).

Value: 2

VOLUME_CONTROL_FIXED

Added in API level 21

static val VOLUME_CONTROL_FIXED: Int

The volume is fixed and can not be modified. Requests to change volume should be ignored.

Value: 0

VOLUME_CONTROL_RELATIVE

Added in API level 21

static val VOLUME_CONTROL_RELATIVE: Int

The volume control uses relative adjustment via onAdjustVolume(int). Attempts to set the volume to a specific value should be ignored.

Value: 1

Public constructors

VolumeProvider

Added in API level 21

VolumeProvider(
    volumeControl: Int, 
    maxVolume: Int, 
    currentVolume: Int)

Creates a new volume provider for handling volume events.

Parameters
`volumeControl`	Int: See `getVolumeControl()`. Value is `android.media.VolumeProvider#VOLUME_CONTROL_FIXED`, `android.media.VolumeProvider#VOLUME_CONTROL_RELATIVE`, or `android.media.VolumeProvider#VOLUME_CONTROL_ABSOLUTE`
`maxVolume`	Int: The maximum allowed volume.
`currentVolume`	Int: The current volume on the output.

VolumeProvider

Added in API level 30

VolumeProvider(
    volumeControl: Int, 
    maxVolume: Int, 
    currentVolume: Int, 
    volumeControlId: String?)

Creates a new volume provider for handling volume events.

Parameters
`volumeControl`	Int: See `getVolumeControl()`. Value is `android.media.VolumeProvider#VOLUME_CONTROL_FIXED`, `android.media.VolumeProvider#VOLUME_CONTROL_RELATIVE`, or `android.media.VolumeProvider#VOLUME_CONTROL_ABSOLUTE`
`maxVolume`	Int: The maximum allowed volume.
`currentVolume`	Int: The current volume on the output.
`volumeControlId`	String?: See `getVolumeControlId()`. This value may be `null`.

Public methods

getCurrentVolume

Added in API level 21

fun getCurrentVolume(): Int

Gets the current volume. This will be the last value set by setCurrentVolume(int).

Return
`Int`	The current volume.

getMaxVolume

Added in API level 21

fun getMaxVolume(): Int

Gets the maximum volume this provider allows.

Return
`Int`	The max allowed volume.

getVolumeControl

Added in API level 21

fun getVolumeControl(): Int

Gets the volume control type that this volume provider uses.

One of VOLUME_CONTROL_FIXED, VOLUME_CONTROL_ABSOLUTE, or VOLUME_CONTROL_RELATIVE.

Return
`Int`	The volume control type for this volume provider Value is `android.media.VolumeProvider#VOLUME_CONTROL_FIXED`, `android.media.VolumeProvider#VOLUME_CONTROL_RELATIVE`, or `android.media.VolumeProvider#VOLUME_CONTROL_ABSOLUTE`

getVolumeControlId

Added in API level 30

fun getVolumeControlId(): String?

Gets the routing controller id of the RoutingController associated with this volume provider, or null if unset.

This id allows mapping this volume provider to a routing controller, which provides information about the media route and allows controlling its volume.

onAdjustVolume

Added in API level 21

open fun onAdjustVolume(direction: Int): Unit

Override to handle requests to adjust the volume of the current output. Direction will be one of AudioManager#ADJUST_LOWER, AudioManager#ADJUST_RAISE, AudioManager#ADJUST_SAME. After the volume has been modified setCurrentVolume must be called to notify the system.

Parameters
`direction`	Int: The direction to change the volume in.

onSetVolumeTo

Added in API level 21

open fun onSetVolumeTo(volume: Int): Unit

Override to handle requests to set the volume of the current output. After the volume has been modified setCurrentVolume must be called to notify the system.

Parameters
`volume`	Int: The volume to set the output to.

setCurrentVolume

Added in API level 21

fun setCurrentVolume(currentVolume: Int): Unit

Notifies the system that the current volume has been changed. This must be called every time the volume changes to ensure it is displayed properly.

Parameters
`currentVolume`	Int: The current volume on the output.